There are new TTPs used in this attack – for example Agent_Drable is leveraging the Django python framework for command and control infrastructure, the technical details of which are outlined later in the blog. The campaign targets Middle Eastern organizations largely from the Lebanon and United Arab Emirates, though, Indian and Canadian companies with interests in those Middle Eastern countries are also targeted. We have been able to decode the raw traffic in command and control, find sophisticated lure documents used in the campaign, connect other previously unknown samples, and associate a number of legitimate organizations whose infrastructure is referenced and used in the campaign. View our webinar on Hunting for persistence using Elastic Security.While reviewing some network anomalies, we recently uncovered Cold River, a sophisticated threat actor making malicious use of DNS tunneling for command and control activities.
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To learn more about threat hunting, download a free copy of The Elastic Guide to Threat Hunting. The features of Elastic Endpoint Security and SIEM - along with the protections provided out of the box - lower the barriers to entry for analysts, provides detailed visibility into endpoint activity, and enables organizations to prevent, detect, and respond to malicious behavior at scale. By building comprehension around adversary tradecraft, you can identify interesting patterns, behaviors, and artifacts that you can use to your advantage.Įlastic Security makes hunting for persistence easy. The number of techniques in an attacker’s arsenal can seem daunting at first, but we demonstrated a formulaic approach to examining, hunting for, and detecting techniques effectively. In this blog series, we examined popular techniques that attackers use to maintain a presence in their target environments. This EQL query can also be saved as a custom rule in Elastic Endpoint Security so that analysts can be alerted every time this activity occurs. In this case, it indicates that WSH was used to interpret a JScript or VBScript object that directly or by proxy implemented a scheduled task using schtasks.exe.
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Windows script host (WSH) is a script interpreter and should generally not have many descendants. This query matches behaviors described in our earlier APT34 example, in which schtasks.exe descended from wscript.exe. By uniquing on the command line, this allows us to focus our hunt on unique task creations and their properties. The EQL query in Figure 7 matches event sequences where the task scheduler process, schtasks.exe, is created by one of several commonly abused binaries and matches some of the command line parameters previously described. With an understanding of the technique, observable artifacts, and common attributes of schtasks.exe execution, we're better prepared to succeed in our hunt for malicious scheduled task creation events. Figure 1 depicts some of the command line parameters available to schtasks.exe, which we can use as references when analyzing task creation events. Threat actors like APT34, APT29, and FIN6 have been known to use scheduled tasks as a means to persist.
It's also essential for security teams to baseline their environment, as knowing all the legitimate ways that scheduled tasks are used will help you become a more effective hunter and identify anomalies more quickly.Īn adversary may attempt to abuse scheduled tasks to execute programs at startup or on a regular cadence for persistence.
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It’s important to be aware of scheduled tasks that exist in your environment (such as maintenance or backup tasks) as well as tasks created during the installation of new software (like PDF readers or browsers). Scheduled tasks run at an elevated privilege level, which means this persistence mechanism can indirectly satisfy privilege escalation (TA0004) as well. Windows provides a built-in utility called schtasks.exe that allows you to create, delete, change, run, and end tasks on a local or remote computer.
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